36 Proceedings. 



Ordinary Meeting, December 10th, 1895. 

 Henry Wilde, F.R.S., President, in the Chair. 



The thanks of the members were voted to the donors 

 of the books upon the table. 



Professor F. E. Weiss, B.Sc, exhibited specimens of 

 Acetabidaria Mediterranean and Caiderpa prolifera, two sea- 

 weeds recently obtained from Naples for the Manchester 

 Museum. The latter is a single-celled alga differentiated 

 into stem, root, and leaves ; the rigidity of the stem and 

 leaf-like expansions is maintained by solid rods of cellulose 

 stretching across the cell space from wall to wall. No> 

 reproductive cells of the nature of spores are known in 

 this genus, reproduction by proliferation taking place. 

 The Acetabidaria is also a single-celled alga fixed to the 

 rocks by root-like branches; the plant has great rigidity, 

 owing to the walls being strongly impregnated with car- 

 bonate of lime. The stalk and disk perish at the end of 

 the season, but the lower creeping portion is perennial. 



Mr. Thomas Hick, B.Sc, exhibited a specimen of 

 Catamites, and read a paper on a " Sporangiferous Spike 

 from the middle coal measures near Rochdale." 



